Energy Saving Using VFD

 

Today, many companies in the world are looking ways and methods in achieving energy saving for their company operation. Saving Electrical energy is like a increase in profit margin. Ac drive is one of the solution for energy saving. We are feeling proud to share the technology of energy saving with VFD.

 

We hereby, Look onto a example report of a shot blasting machine’s ID fan for your kind perusal and consideration to undertake the energy-saving project, which will benefit you.

 

On basis of trials taken at shot blasting machine, We can calculate the energy saving possible at shot blasting machine, ID fan.

 

Motor Name plate Details

18.5 kw/ 25hp

FLA- 37Amps

Efficiency 0.91

2- Pole induction motor

2880 RPM

We connected Energy meter to calculate Energy consumption and took readings approx. half hourly. We also noted the breakdown time as it occurred for better calculations

Please find the report which has Observed during trials

Energy saving effect by installing AC drives to the Shot Blasting Machine ID Fan Motor.

We installed ac drive of 18.5KW Normal Duty (120% overload capacity) in ID Fan Dust collector for energy saving purpose.

Attached are the actual readings which have been collected.

reading-table-with-drive reading-table-without-drive

 

 

Operation detailed noted at actual site condition is as follows

Time duration when machine was stopped.

  • 15 to 4.15
  • 7 to 7.20 PM
  • 30 to 9.00 PM

Total time for data collection: 11Hrs and 15 mins.

Total down time: 1Hrs and 50 mins

Total working hrs: 9Hrs and 25mins i.e. 9.42 Hrs

Actual energy consumption of 210 kWH (from energy meter) for 9.42 Hrs,

i.e. average energy consumption per hour is 22.29 kW.

 

As per information collected from the site total working hours of the machine are 22Hrs.

There fore,

Per day energy consumption of the ID Fan on dust collector is 22.29 x 22 = 490.38 units per day.

 

Reading of energy meter after connecting drive.

 

Drive operation cycle is programmed in such a way, that during blasting process drive is running at   50 Hz (full speed), while in standby/loading mode it is running at 25 Hz (Half the rated speed).

readings-without-vfd readings-with-vfd

 

 

Operation detailed noted at actual site condition is as follows

 

Time duration when machine was stopped.

 

  • 35 to 9 PM

 

Total time for data collection: 10Hrs and 15 mins.

Total down time: 25 mins

Total working hrs: 9Hrs and 50 mins i.e. 9.83 Hrs

Actual energy consumption of 134.5 kWh (from energy meter) for 9.83 hrs

i.e. average energy consumption per hour is 13.68 KW.

 

As per information collected from the site total working hours are 22hrs..

 

We summarize the observation and result here as –

energy-saving-calulations

 

 

 

How are we getting this energy saving?

 

We are taking optimum advantage of ac drive for above operation, by using its feature of           “Auto energy saving for variable torque load”

 

With facility of “Auto energy saving for variable torque load” VFD calculates actual torque requirement and depending upon process condition and this in turn reduces the motor losses and adds up in energy saving.

 

Ac drive operates as Law of affinity as stated below.
Flow rate and air flow rate are proportional to the speed. Q α N
The head and the static pressure are proportional to the square of the speed. H α N2
 
The shaft power is proportional to the cube of the speed. PL α N3

 

Where,

N                          is Speed of Motor

Q                         is Flow

PL                        is Shaft power

 

When we reduce the speed of Motor with VFD, Motors Energy consumption reduces by root.

 

Recommended Brands

ABB, Danfoss, Schneider Electric, Delta, Fuji Electric and Hitachi

If you have any issues regarding using ac drives or VFD in Energy saving you can write us to  info@solims.com

 

We can take trials for energy saving at your factory or we can submit you estimated calculations of energy saving for your applications such as ID Fans, FD Fans, Blowers, Pumps, compressors, etc.

Save energy Save money

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